Element abundances, [X/H], versus the minimum mass of the most massive companion, m_C sin i. Black empty triangles refer to stars with small planets, red empty triangles to stars with giant planets, blue filled circles to stars with confirmed BDs, and violet filled circles to stars with discarded BD candidates. At the bottom of each panel, standard deviations of the mean element abundances are shown for stars without planets (σ_NP), stars with planets (σ_WP), and stars with confirmed BD companions (σ_BD).